No Second Gear, Slips in Second Gear

WARNING: This page is about a different car, the 2007 Pontiac G5 Pursuit, 2007 Pontiac G5, and 2007 Chevrolet Cobalt. However, it is still accessible from the selected car via links, so may be relevant.

Checks	Causes
Second Clutch	No apply or slipping
Piston and Seal Assembly (404)	Binding, cracked, or leaking
Clutch Plates (96-99)	Worn friction or broken splines
Snap Ring (406)	Out of position
Spring (405)	Binding
Driven Sprocket Support (95)	Damaged, leaking, porous
Second Clutch Fluid Routing	Fluid leak or restriction
Valve Body Gaskets and Spacer Plate Channel Plate and Gasket Driven Sprocket Support	Porosity Misalignment Loose or restricted Fluid leak across the channels
Second Roller Clutch (452)	Damaged, not holding
1-2 Shift Solenoid Valve (305)	Stuck ON Plugged
Forward Clutch	Low capacity shows up in Second Gear
Line Pressure	Low pressure Refer to High or Low Line Pressure .
1-2 Accumulator (29-31)	Leak at the piston seal Channel plate or case porosity
1-2 Accumulator Valve (323)	Stuck
2-3 Shift Valve (306)	Stuck in an upshifted position
PSA	Electrical or hydraulic malfunction